Could I get pregnant without intercourse ?

Hi. I am a 17 year old female, and I was wondering.. what are the chances of getting pregnant without actually having sex? Like, if my boyfriend s semen got on my hand and then later it came in contact with my vagina? This is a weird question, but I am freaking out! Thanks. p.s. I have always had irregular periods, and I haven t had one in a few months but that is normal for me. I am also on the drug Spironolactone (50mg/day)